Other observables, such as the absorption cross-section, super-radiance amplification factor, echoes and tidal deformability require detailed knowledge of the connection formulae that can be derived using the remarkable correspondence between BH/fuzz-ball PT and quantum SW curves for \({\cal N}=2\)  theories with \(SU(2)\)  gauge group and \(N_f\le 4\)  fundamental flavours [1]}, [2]}, [3]}, [4]}, [5]}, [6]}. In fact the AGT correspondence (after Alday, Gaiotto, Tachikawa [7]}) allows to gain further insights [2]}, [3]}, [4]}, [5]}, [6]} as we will see later on and in appendix .
